The surge guard is supposed to protect the electrical system from power surges, up to a certain rating. The surge guard cuts off the power surge before it reaches your electrical equipment (or is supposed to), thus protecting them from damage. However, a lightning strike can sometimes be overpowering and too quick for a surge guard to react.

Then I'm confused. What fried all the appliances and converter? I thought it was an electrical surge, which is what the surge guard is supposed to protect against.

The repair man said that the converter blowing caused the surge within the motorhome.
I know we will be replacing the surge protector as well as putting surge protectors on all major outlets.
Thanks for all the input!!

The repair man said that the converter blowing caused the surge within the motorhome.
I know we will be replacing the surge protector as well as putting surge protectors on all major outlets.
Thanks for all the input!!

The repair man said that the converter blowing caused the surge within the motorhome.

We may possibly have some terminology misinterpretations. I don't understand how a "converter" that takes 120 volt AC and converts it to 12 volt DC can cause a power surge to other 120 volt appliances not connected to it.

We may possibly have some terminology misinterpretations. I don't understand how a "converter" that takes 120 volt AC and converts it to 12 volt DC can cause a power surge to other 120 volt appliances not connected to it.

Yes. Something doesn't sound right.
With the information provided I can see the convertor/charger going bad and have a lower dc output which would increase amperage and fry thing on the DC side.
But the Microwave was also fried and it has nothing to do with the Invertor/charger and only the shore power 120 volts.
I say the Surge Guard didn't do its job and allowed high, low or even surging 120 volts into your rig.

I have a Progressive Industries power monitor like this one that I wired into my main cable.EMS-LCHW50C